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The benefits of database abstractions such as Class::DBI are obvious, but the downsides of these technologies can hamper scalability. On one hand, with the CDBI approach, we have a clear mapping of classes to tables, but the databases for which these have been designed are relational when classes tend to be heirarchical. This not only forces developers to accept awkward design constraints (subclassing a table can be an act of supreme masochism), but with the wrong design, it can also limit scalability.